Whip-stitch sewing machine



Dec. 22, 1931. E. MULLER WHIP STITCH SEWING MACHINE Filed Dec. 5, 1950 Patented Dec. 22, 1931 ERNST MTl'LLER, OF BERLIN, GERMANY WHIP-STITCH SEWING MACHINE Application filed December This invention relates to a whip-stitch sewing machine for use with furs and gloves and more particularly to a supporting device for the looper to which a vibratory as well as rising-and-falling and to-and-fro movementis imparted.

One object of the invention is to provide a support which allows an exact adjustment of the looper relative to the needle and prevents twisting movement during the sewing operation. Another object is to eliminate friction and wear and consequent readjustmentsand repairs.

With these objects in view the invention consists in the provision of a looper holder fitted with supporting trunnions engaging by means of cylindrical and conical bearing surfaces in corresponding sockets made in blocks attached to a carrier, the latter being in its .7 turn mounted in the machine frame between pivot pins which engage by means of cylindrical and comcal bearlng surfaces 1n corresponding sockets made in the carrier, the rear end of the looper bar being connected by means of a ball joint to a pivoted link.

Fig. 1 of the accompanying drawings represents a. longitudinal section of the upper part of the improved sewing machine,

Fig. 2 is a cross section of the looper and looper carrier, and Fig. 3 is a sectional view of the ball joint supporting the rear end of the bar.

Rotatably mounted on the looper bar 1 is a holder 2 the ends of which are situated in the same plane as the bar and constitutes supporting trunnions for the latter. The trunnions are formed with cylindrical and conical hearing surfaces whereby they engagein corresponding sockets made in blocks 4 which are secured to a carrier 5. The latter is mounted in the .machine frame between adjustable bearing screws 6 and 6 forming pivot pins 8 which also engage by means of cylindrical and conical bearing surfaces in corresponding sockets made in the end members of the 5, 1930. Serial No. 500,278.

carrier. A lever 9, which is clamped to the carrier 5, is linked to a lever 12 which is controlled by an eccentric 10 and mounted on the main shaft 11 of the machine. The looper bar receives its to-and-fro as well as its risingand-falling movements from the eccentric 10. Connected to the-bar 1 behind the holder 2 is an arm 14 which co-operates with a cam 13, mounted on the shaft 11, for imparting the vibratory movement to the looper. The needle holder 16 for the needle 16 is guided horizontally in the machine frame beneath the looper hook 15 in known manner. The needle holder receives its reciprocating movement from an eccentric 17 mounted on the shaft 11. Screwed on to the rear end of the looper bar is the socket part 18 of a ball joint the ball 19 of which is connected to a pivoted link 20. The ball joint controls the bar and allows a free universal movement of the looper.

I claim:

A whip-stitch sewing machine comprising a looper bar, a pivoted link connected by means of a ball joint to the rear end of said bar, a carrier for said bar, pivot pins for said carrier engaging in sockets therein by means of cylindrical and conical bearing surfaces, a holder rotatably mounted on the bar, and bearing blocks for said holder secured to the carrier, said holder having trunnions formed with cylindrical and conical bearing surfaces whereby they engage in corresponding sockets in said bearing blocks.

ERNST MULLER. 

